Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic , or alternatively antigenic , which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain.

Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic , or alternatively antigenic , which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.